Electrochemical and catalytic properties of nickel(II) complexes with bis(imino)acenaphthene and diazadiphosphacyclooctane ligands

The title complexes were prepared, and their redox and catalytic properties in hydrogen evolution reaction were examined. The catalytic current increases in the presence of a proton source near the potential of the nickel(I/0) couple for a mixture of nickel(II) complexes with different ligands. Moreover, the catalytic activity of mixed-ligand complexes in the hydrogen evolution reaction was higher than that of a bis-chelated diphosphine nickel(II) complex.